It is all about mechanical energy

2. GREENY
ENERGY

3. PAINTTOLE
POTENTIAL

4. PAINTTOLE
NICEKIT

5. GROUP ACTIVITY !!!

6. 1. Do you think there is energy present there?
2. What forms of energy are present in the given
statements?
3. What energy changes take place as an object operates?
4. What form does the stored energy start out with?
5. What form does the stored energy turn into?
6. What made each object move a certain displacement and
what made each object come to stop after being displaced?

7. Energy:
 ability to do things.
 the ability or power to work or make
an effort.
 Capacity of matter to perform work
as the result of its motion or its
position in relation to forces acting on
it.

8. Kindsof Energy
 Potential Energy
 Stored chemically in fuel, the nucleus of atom,
and in foods.
 Or stored because of the work done on it:
 Stretching a rubber band.
 Winding a watch.
 Pulling back on a bow’s arrow.
 Lifting a brick high in the air.
PE= mgh

9. Kinetic Energy
 The energy of motion is called kinetic energy.
 The faster an object moves, the more kinetic
energy it has.
 The greater the mass of a moving object, the
more kinetic energy it has.
Kinetic energy depends on both mass and velocity.
KE= ½ m𝑣2

10. Activity : Complete Me!

11. EVALUATION:
1. What does the law of conservation of mechanical energy
state?
A. Potential energy is always equal to kinetic energy
B. Potential energy is always converted to kinetic energy
C. There is always some energy lost as heat
D. For any system the total amount of mechanical energy
remains the same

12. EVALUATION:
2. Why would a system have less energy than it originally
started with?
A. The energy was lost as heat.
B. The energy was destroyed.
C. More energy was created at the beginning than at the end.
D. The temperature was too low to create heat.

13. EVALUATION:
3. Which best describes potential energy?
A. Energy of motion
B. Energy as heat
C. Stored energy
D. Energy that is doing work

14. EVALUATION:
4. Which of the following happens to the energy of a coconut
that falls freely?
A. Loses potential and gains kinetic energy.
B. Loses both potential and gains kinetic energy.
C. Gains potential and loses kinetic energy.
D. Gains both potential and kinetic energy.

15. EVALUATION:
5.Which of the following are two types of Mechanical Energy?
(ME)
A. Kinetic and Potential Energy
B. Kinetic and Nuclear Energy
C. Potential and Chemical Energy
D. Thermal and Kinetic Energy

16. ANSWERS:
1. D
2. A
3. C
4. A
5. A

17. ASSIGNMENT:
Directions: Answer the given word problem.
Show your complete solutions.
1. How much kinetic energy is gained when
2000 kg of water falls from a height of 40 m?